//
// Created by 51165 on 2025/10/22.
//
//
// Created by 51165 on 2025/10/22.
//
#include <stdio.h>
int main() {
    int n = 0;
    while (scanf("%d",&n) != EOF) {
        for (int i = 0;i < n;i++) {
            for (int j = 0; j < n; j++) {
                if (i == 0 || i == n-1 || j == 0 || j == n-1) {
                    printf("* ");
                }
                else {
                    printf("  ");
                }
            }
            printf("\n");
        }
    }
    return 0;
}